fix(events_targets): installing latest aws sdk fails in cn partition

[GavinZZ]

Issue # (if applicable)

Closes #29373

Reason for this change

AWS Log Group event target by default installs the latest aws sdk for its custom resource and this would fail in aws-cn partition. This PR exposes the installLatestAwsSdk to the surface and allows users to optionally turn off installLatestAwsSdk for cloudwatch log events target.

Description of changes

Allow users to override the value, if unset default to true which is the same behaviour as current.

Description of how you validated changes

all tests pass.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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[pahud]

LGTM

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 1a5cc88
• Result: SUCCEEDED
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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).